It's not been a good couple of days for T-Mobile. While reducing mobile data contract limits to 500MB per month across the board might have looked good on paper (at least, for the company), it didn't exactly play out well with the public. In fact, it resulted in a huge amount of bad publicity for the network, which has resulted in a bit of backtracking.T-Mobile has now amended its intital statement, which means existing customers will not see their mobile data allowance cut to 500MB. That's good news for all of those people with hefty data allowances (some as high as 3GB per month), but still leaves the 500MB offering on the table for anyone signing new deals with the company from February 1st.Speaking about the issue, Lysa Hardy, VP at T-Mobile UK said: 'On Monday 10th January 2011 we announced that, in line with the rest of the industry, T-Mobile would be reducing its Fair Use Policy for data usage to 500MB a month for all mobile phone customers.'Following a further review of our policy, these changes will now be introduced from 1st February, to new and upgrading customers only - not existing customers. There will be no change to the data packages for existing customers for the duration of their contract and we apologise for any confusion caused. The revision to the FUP is designed to ensure an improved quality of service for all mobile internet users'.While that's obviously a step in the right direction, you do wonder how many people with data-heavy smartphones will be keen to keep a contract with T-Mobile when the existing one ends. Although with the exception of Three, healthy data deals aren'r exactly plentiful in the market right now.